Mass license plates for my cars

In the Commonwealth of Massachusetts, license plates are stickered, with the rear plate getting a year sticker.  I found out that you only have to turn in the rear stickered plate, so I kept the front plates for my collection. 

The "Right Whale" plate was issued in June 1998 for the 1998 Honda CRV. 
The "United We Stand" plate was issued in December 2002 for the 2000 Honda CRV.