Don't think too much into cellaring. It just means putting unopened tins away to smoke later. I used to put them on my bookshelves. Then it became too clustered. So I put them in old plastic bin. Now I don't even take them out of shipping box. You don't even have to think about aging them. Unlike wine, no right way to store the tin. As matter of fact, you don't have to think about tobacco at all. They will accumulate all by themselves as long as you have credit card and membership to this forum. You will take out your credit card without thinking when there's a new release of some blend!
On storage, a friend of mine had boxes of tins in his cellar. Here in New England, many old homes have periodically wet basements and his was not an exception. And many of his tins had developed exterior rust.
There is no way I have found to prevent interior rust - as was common with some older GLP blends in the narrow tins, and with some other brands as well; so, I jarred the old GLP's and keep my fingers crossed with others like the old rectangular Bengal Slices, Penzance, and Krumble Kake. I will note I have not had that problem with any Mccelland tins.
In any case, one can fight back against exterior rust. And doing so can make good sense in the longer term - some of these tins become rare and valuable for trading or selling. I have a dehumidifier in my basement, and the temps are fairly stable / cool. I went over the top (likely) by using vacuum seal food saver bags on all my rectangular tins...thinking that maybe the vacuum pressure will mitigate some risk of those tins coming unsealed. And I sealed up my round screw top tins (Dunhill, Esoterica, etc) as well - less necessary with those because of the threads but I apparently had too much time on my hands when I did it. I did not seal up any of my Mccelland tins or Rattray's tins with the pull tops.
My long-winded point is that humidity is probably not a friend for cellaring, and significant temperature fluctuations / extremes may not be either; I do not store tins in my attic because it gets super-hot in the summer.
