You could flatten empty paper towel roll tubes to protect the knives.
Although, since your are only concerned about 11 days' time for storing the knives, just wrap them in some paper and put them in a secure place. You DID say payday was on the 31st, correct? It's not too far away. It's not like you're storing them for a lifetime.
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!