It is very hard for us to appraise names without knowing what they are! And I understand you not telling us, because they are not regged! Probably the best thing to do is go to www.acronymfinder.com and see if they could be used? Or if you really think they might be worth something, just take a risk ... dont forget the domain name industry is very speculative, I take risks with every name I reg ... you just never know.
There have been many times, I have decided not to reg a name, or just think about it, then all of a sudden the name has been regged! A prime example of one of the worst decisions I made was by not regging a domain name I saw at deleteddomains.com called www.messagepal.com and now it looks to be a big money making site with a brilliant name!