Back when we had to use the Source SDK tool to open Hammer, the install of it included a bunch of official vmf files (non-decompiled!) for a bunch of maps. Since Source SDK is no longer required, and it seems like they aren't included in that install anymore anyway, here they all are!

Files included in this zip file:

cp_game_entities.vmf
mvm_example.vmf
sdk_arena_lumberyard.vmf
sdk_arena_ravine.vmf
sdk_cp_badlands.vmf
sdk_cp_dustbowl.vmf
sdk_cp_granary.vmf
sdk_cp_gravelpit.vmf
sdk_ctf_2fort.vmf
sdk_pl_badwater.vmf
sdk_pl_goldrush.vmf
sdk_tc_hydro.vmf
sdk_tr_dustbowl.vmf
sdk_tr_target.vmf

Click to expand...

Note that these are not necessarily the latest versions of these maps, so things might be a little different from current stock. These are intended to be for educational use. I obviously hold no rights to these, they are 100% Valve products, I'm just sharing them for ease of use.