How can I check if my truck was ghost deleted?

[Hammerhead]

Do you have an Inline connector and/or Insite?
If yes, connect and observe.
If no, split the DPF/DOC V-band clamp and peek inside to see if they are intact or not. This is not an absolute guarantee as some idiots really don't know what they're doing.
An ECM/computer diagnostic connection is the best way
Remember, the vast majority of demandates are horrible, and done horrifically wrong...

Some other tell take signs:
Blocking plate at the EGR Venturi/mixing pipe on the intake
Blocking plate or such at the exhaust manifold "U-bend" into the EGR cooler bellows pipe
Truck smokes a little at the snap of the throttle when at dead idle
EGR components visilually missing; EGR cooler, VGTurbo, EGR valve, EGR mixing pipe, dozer valve, blocking plates on the back of the water pump/back lower pass side of block where the EGR cooler would receive/return coolant (if you know what an EGR cooler is, this is redundant)