I had a similar occurrence with my grapple. According to the LandPride specs it came with Pioneer and flat face couplers. The dealer put the Pioneer on, since I was using it with an L model. When I picked it up, the flat face couplers weren't with it. I brought it up and after some discussion with the shop, they provided them. I think they put stuff like that in their junk pile, thinking they're more likely to need them than the original customer.
Even though L35's originally included the 3pt arms, it's pretty rare to find one for sale that has them still around. Like mine, many have never had the BH off, and the arms get misplaced.