Hi Johnny,

What flavours were they?  One or two flavours are so strong they will last for decades. Absinthe being the longest lasting.

If you get a small jar and put pin pricks in the lid, then fill it with cooled boiled water.  Next, loosen the lids of the old tins and the water jar them put in a box, tub something with a lid. this will rehydrate them.  Still might not save them but might be interesting to try.

Also, if I can be of any help don’t hesitate to email me roderick@toquesnuff.com