Yeah, a cool dry place is always best for storing chemicals. But for the phenethylamines, with or without the N-benzyl substitution (ie ordinary PEAs or NBOMes), the storage conditions are not that critical like they are for 4-position substituted tryptamines, which fall apart easily upon exposure to heat, light, moisture, or some combination of these factors. PEAs are inherently stable molecules, so you don't need to be concerned with the 25B degrading over time. Obviously there's no reason to be ridiculous and store them in a hot, wet, bright place just to tempt fate so to speak, but NBOMes and PEAs even more so should be stable over many years even if they're simply put into a baggie and left on your desk.