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