Well, call me reckless, but I keep all my silicone in plastic bags... and often a few toys to a plastic bag. (Plastic ziplock for anal toys, and a couple plastic ziplocks for vaginal.) I'm more careful with my Jollies toys because of their irreplacability, and my dual densities because of their fragility, but I have some silicone (Silk medium and Cone) that have been stored together for upwards of two years without any problem.
I'm on a phone, so forgive me for not linking, but if you check the edenlink q&a we had with Tantus, Metis said after their toys were pulled from the molds but before packaging them, they're all just stored together in a bin.
I am not a materials scientist, so I don't have the correct words, or the actual knowledge to back thos up, but the impression I had gotten was that, after liquid silicone has been resin-ified by exposure to the (platinum in sex toys usually) catalyst, it becomes inert. The problem that silicone toys have with silicone lubes is that (especially the softer the silicone resin is, because the softer it is, the less the molecules are cross-linked) the fluid dimethicone and cyclopentasiloxane (if misspelled, sorry, phone) can begin to cross-link with the free molecule ends. But since two catalyst-cured, resin dildos are not fluid, there's not a lot of molecules to cross-link with, just from a "molecules can't slip around and find compatible sites" perspective.
That's why I'm extra careful with my dual densities and softer silicones, though, because they have dimethicone in their outer resin matrices (at least, Vixen's website says so, I assume it's the same across brands).
But in general? I keep my silicone away from tpr toys that might have plasticizers, because plasticizes can be destructive---but I'm not afraid of keeping silicone together, or in ziplocks. It's been working for me for years