Hell your steel Co2 bottles filled with dry Co2 gas or any bottle with a trace of moisture causes carbonic acid that etches or eats into the those steel bottles. When tested, actually sonic wall thickness tested they can detect how bad this etching has gone into the original bottles body. They also tumble the bottles with a media material, wash, dry and inspect before refilling after a sonic test has been preformed. Steel is as clean as aluminum bottles on "rust taste".
My two bottles made by Linde of 150 and 260 cu/ft shipped over to Europe during the Hitler era have been stamped and restamped over app 7/16" Swastika to make a 4 square box to be PC are date stamped 59+ rehydro and a 41+ and still pass at a 10% overcharge in fillings. Older is better as one HBT member told me in the gas bottle refilling business plus bottles he has seen 1880, 1900's plus that pass the sonic check to this day. I'll keep these and no exchange, fill and keep these history plus owner owned bottles.