About the USA 7 - the "p" in paul is very tough to make out, as it is under the store stamp, and it may not be there at all. There are markings there though. It might make a "p" or it might not. I'm just not sure what other letter would make sense there. If there is a "p" there, it appears to be upper case non-cursive.
Also, there is another name written across the star in captain america's chest. It's also four letters. The first letter could be a capitalized cursive "F" or a "J". The next two letters appear to be lower case cursive "an", and the last letter looks like a lower case cursive "s". Does that ring any bells?
(image is clickable)