Might be legit, or it might be a $15.62 learning experience. Unless, of course, what they are really after is your credit card info. Never dealt with E-Bay so I have no idea how closely they monitor such things.

Need more coffee!

I had a 5D before buying an R and then selling that and getting the R5. I had an EF 24-105 f/4 L and a number of other EF lenses. The first lens I replaced was the EF 24-105. If I remember correctly I bought the R as a kit with the RF 24-105 f/4 L, since that is such a handy lens. I had no particular pattern of buying new lenses. If I saw an RF that I liked I would buy it and sell whatever EF lens I had that it would replace. I also went for faster lenses than what most of my EFs were. An RF 85mm f/1.2L, then an RF 50mm f/1.2 L, as well as an RF 16-35mm f/2.8 L and now this 28-70. I kept my EF 100mm f/2.8 L Macro and my EF 100-400 L II. I don't see where there is anything in the RF lineup that is a noticeable improvement over the EF 100-400.
I just sent the RF 50mm f/1.2 and the Macro off to KEH since I just don't use the Macro and in the 50mm range the 28-70 f/2 should do everything I want.
I have been distracted from photography for a while now so I figured a new lens would be a good jump-start. Seems to be working so far!

Let's hope so!

Thank You!

Just got a Canon RF 28-70mm F/2 L USM lens for on my R5. So far I'm really happy. Produces very clear shots and the F/2 does very well in low light.
This was shot JPEG SOOC while just sitting around. No flash and not great lighting. F/2 at 1/15 sec and ISO 200. Handheld. Not a stabilized lens but the R5's IBIS works well.
Going to shoot basketball next weekend at the local community college. Eager to see how it does compared to the RF 85mm F/1.2 L that I have been using.

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Just be glad the stork didn't get confused and leave you a surprise delivery!

Please do us all a favor and use "Quote Reply" when responding so that we know who you are responding to.

Take your 6.3 lens to an indoor basketball game and then tell us how happy you are with it. Slow lenses work just fine in many situations, but if you are shooting action shots, in marginal or even good light, I'll take a fast lens everytime.

I just went to the B&H site, selected a random item and clicked Add To Cart. Went in with no issues. Put it in, took it back out. Everything seems normal. I didn't bother to log in, but that shouldn't make any difference.

You're right, but, you know this is a six year old post, don't you?

I think you will be happy and with the number of Canon lenses that have been produced you should have no problem finding good used ones. I would stick with retailers like Adorama, B&H, KEH, etc. Their prices are fair and their condition ratings are, if anything conservative. Definitely go with the Canon EF/RF adapter. Aftermarket adapters are of varying quality. Some work great but there have been claims of some producing a loose fit.
Most Canon lenses are very good. Many are excellent. A few are untouchable. There are a few clunkers though so pay attention to reviews. If you are not familiar with designations then "L" is the premium line. Very hard to find an inferior lens there. IS is Image Stabilized. The lens has internal stabilization which will work in conjunction with the in-body stabilization that some of the R series cameras have.
My nephew is in the process of switching to Canon mirrorless. He was a newspaper photographer in the '90's but about 20yrs ago he started a hardwood floor contracting company and photography became a sideline. He was a 100% dedicated Nikon guy. According to him Nikon DSLRs are the cameras of the Gods! Decided to try mirrorless this past summer. Bought a Nikon Z9. Liked it. Then, surprise surprise! He decided to try Canon. Bought an R3 and RF 70-200 f/2.8 L. At first all he would admit to was being quite impressed.That was 6 weeks ago. Last week he mentioned that his 2nd R3 had just arrived, along with a second lens and that he is in the process of selling his Nikon gear. Already got his next lens picked out: an RF 400 f/2.8 L. I would have taken any bet that he would never leave Nikon, especially for Canon, but, apparently pigs have started flying!

Me too. Bought the control ring adapter but never use the ring. Never use the ring on my RF lenses either. Just old habits, I guess.

True, but technology has this rather annoying habit of constantly changing and improving. I have a 2Tb back-up drive that gets lost in my shirt pocket. Not long ago people would have laughed if you said that was possible. Photo technology is going to change. Cameras are going to change. Count on it. Maybe the cellphone camera, or something similar is the future. Maybe not. Whatever is coming next is going to be different then what we have now, and better besides. You can count on that also.

I mentioned the seal ring on some Canon lenses. Primarily the L series which is Canon's premium line of lenses. The ring is around the outer edge of the lens mount and provides a weather seal. Professionals often are out in the rain, and even amateurs at times. I got caught in the rain not long ago and it was nice to know that my R5 and L lens are quite resistent to moisture. I stated that the ring may provide some snugness, but, probably little if any. Never hurts to check all components though when you have a mystery problem. The OP found his problem. The four screws on the mount were loose. Simple fix.