Let me know where they are located and I will gladly test 29 bags for you. I bought 30 bags 2 years ago and I have noticed no difference from 1st bag until now. Probably have enough left to get ne through this year.
Back in 06 HD had a blowout sale on Rancher all natural briquettes made by the Original Charcoal Company.
We bought a pallet full and that lasted a few yrs.
That was in paper bags, Weber has plastic bags so no problems with moisture.