I think they will turn out fine. I've been working with some milled 2-row and malted rye I had forgotten about for a little less but still a while (may 2015). Stored in those Petco vittle vaults. First batch turned out pretty great, got another going right now!
I have a large Petco Vittles Vault filled with pre-milled 2-row from more than 18 months ago. It was stored in a dark corner of my basement and I forgot about it. I just found it today and pulled it out; smells fine, and it looks pretty normal to me. It WAS mostly full, and the vittles vaults...