Thank you for your advice!
I figured I wasn't the first person for this situation to happen to (nor will I probably be the last), I just wasn't really sure where to look in the forums for an answer. ^^;
I took another look at the bags and sniff checked all of them (from Craiga 01453 's suggestion): one of the bags seemed salvageable, but everything else had to be tossed (plus two of the bags looked like they had major freezer burn on them).