Amen. There is no compression seal in a plastic or metal coffee container, (never saw a glass one), so all you have really is an oversized film can, with a low quality plastic lid that pops onto a low quality plastic body. While this might be a great way to collect rainwater in the forest, it's probably not such a great idea for a trinket & logbook storage device. Placing baggies in them might help, until the baggies get punctured. These things, (along with any other crappy plastic containers), should go into a recycle bin, not a forest.
One of my most basic mottos is; if you must use a baggie to protect the contents of your cache, your container has already failed at a very basic level. Take pride in your hide. Don't use crap just because it's free.
I use glass Coffee jars with v.good seals on them... I originally tested them for 3 days under water... not a drop inside!