i can understand that. the type of foam used does tend to squash, and stay that way, if the pressure is kept on for a great deal of time. the mute foam for example; if i leave the mute on, and put the guitar in its case for a long period, the foam gets grooves in it from where the strings were all that time. then they slowly go back to their original form.
and the foams will be rock hard anyway in 30 years time |: