Questions Regarding 1976 Proof Quarter

Bought a few proof quarters on eBay a couple months ago. The title and item specifics section describe the composition as silver. The description also says they are from a Silver Bicentennial set and that they are in the original capsule. I took a photo of one in the capsule before cracking it open (see below). My first question is, were the silver set coins only in capsules? Or were both silver and non-silver proofs in capsules? As you can probably tell where I'm going with this, I'm not certain I was sold the silver ones. That leads me to my next question... are the silver proofs all silver around the edge? Or being 40% silver, do they show some of the copper color along the edge? The ones I purchased appear to have some copper showing.

I did a sound test comparison using a 1976 silver business strike quarter that I know is real and also a clad quarter. The subject quarter does sound more like the silver one when dropped on table, however not something I'm 100% confident if silver still. I also did a rare earth magnet test, but the magnet seems to move the same over the silver and clad (at 45 degree angle) so I don't know if I'm doing it right. Does anyone know of another way to test this thing?

Lastly, the proof quarter is very uneven in planchet thickness. One end of is noticeably thinner than the opposite end. Has anyone ever seen this with 1976 proofs? I am also providing a photo of the thickness below. I don't know if it's very noticeable in the photo though. The top is the thinker end.

Thank you in advance for any replies.

P.S. I also attached a link to the original eBay listing.

http://www.ebay.com/itm/1976-S-BICE...QUARTER-SILVER-COMEMORATIVE-SET-/151138301281

 

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Just check the weight of the coin really easy way to tell for sure without dropping the coin, etc which are pretty destructive things to be doing to a proof coin unless you just bought it for bullion value.
40% silver 5.75 grams
Clad 5.67 grams

Edit- also to add your coins picture looks like a it's a regular business strike 40% silver coin that were also sold in 3 coin collector sets and not a proof but that could just be the angle and lighting conditions.

 

Wow I'm an idiot. I didn't think to weigh it. Okay it's the real deal.

EDIT: Thank you Blissskr.

 

Endeavor, I like to call those "having a blonde moment"! BTW, I have blonde hair in case anyone is offended.