IMHO, wholealers offer the best value for C&R holders.
You can send an ink signed copy of your license through the mail, scan and email or fax... depending on the vendor.
Mosins are tough to beat for affordability both in terms of purchasing the rifle and also milsurp ammo.
I don't think you'll ever pinpoint exactly "who" does the hand selection. An employee of the vendor, usually they pick the best per 5 or 6 weapons readily available.
Do your homework if you plan to do business at a gunshow. There are plenty of opportunities for bargins but also plenty of folks who grossly overpay because they are unaware of fair market value and get caught up in the moment.
Just my opinion. Good luck and enjoy your C&R.
Take care when you get information.
The truth is generally seen, rarely heard.