One of our customers today pointed out the perforce "where" command

You can specify the right hand side of the depot view like so
p4 -c clientname where -Ttag //clientname/bambooDev/...

and get useful information back, such as:
... tag tag
... depotFile //bambooDev/...
... clientFile //clientname/bambooDev/...
... path /p4-client-workspace/bambooDev/...

I am not sure what version of perforce this command is available and not sure how reliable it is, but it is definitely worth some further investigation as we can cut down several of the perforce calls if we avoid retrieving client data.