I previously bought one of those foam router bit storage trays a year back or so. I thought it would be a great way to store bits, however I just discovered the bits had rusted where they were sitting in the foam (despite a dehumidifier working its butt off to keep my basement at 50% RH). The bits in my case (a big box set I bought with my upgrade to a 1/2" collet router) with plastic inserts however are a-ok. Luckily the rust wasn't too bad and it was only 3 bits - I was able to clean them up with fine scotch-brite and remove them from the foam (and luckily the carbide bits don't rust).
Two ideas come to mind - buy a bunch of those plastic inserts for these router bits (from where, and what are they even called?), or drill oversized holes in a scrap of wood to store the bits in. My gut says the inserts are the way to go. Anyone experience this issue before and have any wisdom to share? My end goal is to have something I can store on the shelf of my router table, set on the workbench when I'm using the table, and then return to that shelf when I'm done using the router table.