prop_loot_crate

This entity is not in the FGD by default.
See below for instructions on making it available.

prop_loot_crate is an e0 available in Counter-Strike: Global Offensive.

Warning:

• The {{{game}}} parameter is inconsistent with the name defined by the {{csgo}} template. This can most likely be fixed by setting the value of the {{{game}}} parameter to Counter-Strike: Global Offensive.
  If a parameter is consistent but you're still seeing this warning, it may be an issue with the template itself. Please discuss it on the template's talk page.

It's one of many new entities added with the Danger Zone update.

Warning:Manually placed entities won't work like they're supposed to.

Note:This entity won't show up in game unless it has model keyvalue specifying path for model to use.