My apologies for the belated reply here; I haven’t been reading very deeply into the site lately…! 
One of the suppliers of dehydrated (powdered) eggs https://www.usaemergencysupply.com/information_center/powdered_eggs.htm says thus:
sellers, above wrote: Once Opened, How Long Will Powdered Eggs Last?
Stored in the absence of oxygen and placed in a cool storage environment, powdered eggs have a storage life of 5 to 10 years. Once a container of powdered eggs has been opened, it is comparable to any other dehydrated dairy product and shelf-life would be measured in weeks or a month. Many people opt to refrigerate the remaining portion or only open as small a container as possible. If the goal is to keep the remaining powdered eggs long-term, we recommend that you re-pack the remaining portion in a smaller container with an oxygen absorber. Keep in mind that the eggs will only store as well as the condition of the original product - and therefore, should be free of moisture and oxygen.
In other words, I think, best packaging is the original, if it is foil packs or plastic-lined tightly sealed bags, stored in colder-is-better (your freezer?). If otherwise packed in bulk (buckets?), you will need to repackage into smaller mylar bags with oxygen-absorbing packs, heat sealed (use your iron) and otherwise vacuum sealed – or maybe use one of those vacuum-sealing gizmos on late-nite TV? Since a little can go a long way in an average household, smaller packs are a good idea to ensure freshness if using over a longer period. Most of what is sold in bulk these days is intended for volume users – bakeries, etc – who might be expected to consume a full bucket in only a day or two.
A bit of investigation about exactly how the original is packed is time well spent, I think. And learning how to repack stuff is highly useful info. Lots of websites offer good advice there. Some good points here: https://www.usaemergencysupply.com/information_center/packing_your_own_food_storage.htm
Personally, I’ve invested a bit more in freeze-dried eggs packed into cans – should keep forever, or very nearly. Otherwise, I can keep using fresh until needed.
Cheers,
Selene
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