We brought our patches with us to the MK Fire House about 2 years ago. We travel to WDW 2-3 times a year and we always went to the station to see if our patches were displayed.
We never saw them as asked the CM several times what happens to the patches if they are not displayed. We were told that they receive many patches and sometimes they "magically disappear" from the Fire House. We have noted that the some of the patches have been displayed at the firehouse for some time.
When I was there in March I again stopped by and a guest was leaving a patch with the CM. She told us that because they receive so many patches and they have been asked why they are not all displayed, The Fire House Staff is going to add a new display board and the patches will be rotated on a "regular" basis.
I asked what "regular basis" was and she told me they hoped to change them and add new ones every 3-6 month.
Sounds like a great idea to me - Look for your patches on your next trip to the MK Fire House !
Bob D.