I just picked up 3x boxes of 4x5 HP5+ sheet film (75pcs) for a good price. It was a good price because it expired in May '07. Yes, it has been kept refridgerated and yes I'll be tossing it in the freezer when it arrives. With 35mm and 120 b&w films I've never really had an issue with expiration dates prior to exposure (post-exposure is a different story). In fact, the PanF in my 6x12 filmback expired in April of last year
Here's the question: due to the difference in thickness between sheet film and roll film due I need to be more wary here? I mean, with development there are sometimes differences because of the thickness.