Quote - I'm trying to edit a .pz2 - I do have "Use external binary morph targets" checked.

No, it's probably better if you don't use that option, for a number of reasons, but for a pz2 it should not make any difference one way or the other.

Quote - I was thinking they'd be PBMCC_41 or something because I tried using the search tool in my Crimson word editor and it doesn't find anything.

Assuming that you used the option to "Include morph channels in pose set" you would normally expect to find channels labelled PBMDC_## and PBMC_## (where "##" stands for any two digit number) in the pz2. A pz2 saved form Poser does not include the dial name in the pose, so you need to know the internal name. A morph channel in an animated pose with key-frames will look something like this. I have coloured the diffrent parts to show what they are. The orange part is the channel type, the channel internal name is in blue, green is the frame number, the dial value of the channel for that particular freme is in red.

        <span style="color:rgb(255,102,0);">targetGeom</span> <span style="color:rgb(0,0,255);">FHMPaul  </span> 
           {
            keys
                {
                k  <span style="color:rgb(0,255,0);">0</span>  <span style="color:rgb(255,0,0);">0</span>
                sl  1
                spl
                sm
                k  <span style="color:rgb(0,255,0);">4</span>  <span style="color:rgb(255,0,0);">0.51</span><span style="color:rgb(255,0,0);">0</span>
                sl  1
                spl
                sm
                k  <span style="color:rgb(0,255,0);">9</span>  <span style="color:rgb(255,0,0);">1</span>
                sl  1
                spl
                sm
                }
            }

If the morph values have been saved to the pz2, then searching for the string "targetGeom" (note the upper case G) will find any morph channels recorded in the pose file.