This was just discussed recently IIRC. The early cars (TR-2's I believe) did come with carpeting in the trunk, and it was mentioned that it was not bound.. I'll see if I can find the thread.
I just looked in the parts catalog, and it shows that they went from carpet to the mat at TS23014.
Edit: Bill Lynn mentions the boot carpet in the TR2 in this article from the VTR and he says it's not bound. Also, TRF shows that that they supply the carpet
NOT bound as original if you desire for the TR2 & TR3.
https://www.vtr.org/TR2/thoseTrailblazingTwos.shtml