You Inspect The Box Again

It is a little wooden chest, the lid opened on a brass hinge.

The inside is green felt, and you trace your fingers along the surface. You can’t find any other opening.

Lifting the box up, you look at the base. There are no markings or signature on its bottom. You place it back on the table and shake your head.

Do you…

…rip the felt out of the box?
…move to the ventilator fan to try and climb into the shaft?
…search your pockets?