My test indictor for properly functioning Oxygen Absorbing Packets while packaging bulk storage in food grade buckets is the downward pull on the lid. If a good seal is formed by the lid (which is imperative for any method of purging the Oxygen) the packets will cause a vacuum to be created in the bucket and the lid will be concave. It may take up to three (3) days for this to happen. I have had one bucket so far not seal properly and it did not display the concave lid. I replaced the lid and absorber packets and the lid then showed that a vacuum had been created. This is also how I determine if the seal is holding over the long term.
A good source for the absorber packets is Walton Feed [in Montpelier, Idaho, near the Wyomimg state line]. They sell packets of 100 at a very reasonable price along with buckets, lids, and bags. Not to mention all the other bulk foods at good prices for those of us located in the Pacific Northwest. I drove from Montana to their location in Idaho to pick up my first large order and saved twice what the shipping would have been over what I spent in fuel to make the drive. I also liked not having to explain to anyone about a large delivery of food. – K.L. in Montana