Some second hand experience with sheath storage vs a plastic case.
I loaned out my "reject" Ang Khola for a few months. I did not send the sheath with it but put it in a padded plastic case. When I got it back it was blacked and rusty. The blade was well oiled.
I loaned the "reject" out again but this time with the sheath. It came back not rusty at all. The knife was well oiled as well and loaned to the same person. I polished the rust off before the second loan.
Will
I loaned out my "reject" Ang Khola for a few months. I did not send the sheath with it but put it in a padded plastic case. When I got it back it was blacked and rusty. The blade was well oiled.
I loaned the "reject" out again but this time with the sheath. It came back not rusty at all. The knife was well oiled as well and loaned to the same person. I polished the rust off before the second loan.
Will