What do you mean by "gone"? At least three of them are built into TRS 2010 and I believe TRS 2009 as well. Built-in assets cannot be deleted, only disabled.
These are on the DLS:
CN RDC,<kuid:58843:153>
CN RDC Old,<kuid:58843:160>
CP RDC,<kuid2:58843:159:1>
They're also built-in in TS2010 except the third one is a :4 version.
.... But be warned that these models are *really* old and pretty much unsuitable for reskinnng. I should know. Made a few b&m units and thought my eyes were going to bleed From the low res textures
