Oh dear, that must have been very uncomfortable, I can just imagine the relief when you left and got back home!
As for the lost felt, it will pop up sometime, unless it somehow landed between a newspaper and was tossed in the bin; hopefully not!
Arthur hid a dongle for an engineering program in a 'safe place' when we went on holiday about a year before he passed, was so frustrated as he used it to design projects that he still wanted to do. I still haven't found it, it's so tiny!
Hopefully, your felt cover turns up one of these days!