Do you mean the current capsules, that are not flat, and have prongs inside in a triangle? Older coins will move around a bit inside those - make a rattle if you shake it. Newer coins you won't be able to get out You could use Lighthouse 40mm capsules. I checked with a '98 panda and there is no rattle at all.
There is a huge lot on ebay for $150 (US) title "HUGE LOT OF 2000+ Panda 1 Ounce Silver Coin Capsules in original box! *No Coins*" from description: "silver 1OZ 2014 Panda capsules in the original Chinese Mint shipping box. " item number 251715046834 Maybe someone else here with interest can buy them and send you a few
I'm not a fan of panda capsules. They're slightly convex, which makes them s PITA to stack in your SDB.
Leave your pandas into the sheets. They are also in a vakuum area and protected addionally against their nature of toning.