A grommet is what holds the badge in place on the drum. I would visually inspect it in person. Make sure all the drums are in order, same lugs, no cracks in shells. Sometimes just looking at a drum for a few minutes will allow you to see things that you've missed in pictures.
If he has a date of manufacture, check the drums, their might be a stamp. Interiors can be painted, and new paint will be easy to see. I inspect the inside of drums to see if someone has taken it apart, check a date, bearing edges. Check drums side by side for matching lugs, rims and wrap. Make sure all parts are working, look for stripped threads, mismatched floor tom holders. Repairs and/or signs of replacement of badges can be a warning sign to restoration and some people are very good at making excellent copies of good drums with imported drums.
Spend a few minutes taking the drum apart with owner's permission to inspect. Two things happen, maybe a third. One, you can find issues. Two, the seller will know that your not just a "kick the tires" kind of guy. Lastly, after buying several kits myself, and inspecting them before I buy, you can point out things the seller may not have noticed, and that may give you an edge on a price drop.
The extra 2 legs is not original, but could have been made that way or added on after the fact, see how well the front match the rear.