I was an early adopter of the Ink Thrift keys and capsules system when it was released for my 1400 printer.
I originally bought a few sets of spare prefilled capsules, I think from Amazon, but soon after I bought bulk ink and started refilling.
These prefilled capsules ended up not being used and were forgotten since then.
I just found them and they are still sealed in the original mylar (?) bags but most of the ink is gone from the capsules. There is no leaking, the capsules are sealed tight and clean but there is only about 1/4 to 1/2 of the ink remaining.
Where did the ink go?