I would not open unless your totally into preserving these coins in an non evasive protective holder. Proofs need to be handled in a very careful manner.
Ok...now to the coins. Main focus in this set (IMOH) is the Franklin. The 1961 is where you may find the sought after Double Die Reverse of the Franklin. I've collected for many years and went thru many 1961 Proof Sets and have yet to find this Ultimate Gem. Can't tell by your pics but here is the NGC Variety Site with information on the 61-DDR Franklin. There are stages of this variety but the more extreme the DD "U Plurbis Unum" the more desirable.
https://www.NGCcoin.com/variety-plu...s-1948-1963/Just scroll down to 1961 and look for CONECA: DDR-003 and CONECA DDR-001
By the way, Proofs (on the normal) need to grade very high in the upper 60's Range to be worth busting out of sets...just sayin!