It does matter. You can only get TLE prior to checking out or after checking in. Below is from the link above.
a. before leaving the old CONUS permanent duty station (PDS),
b. after arriving at the new CONUS PDS
Until you check in you are just on leave or travel. So if you are on 10 days of leave once you get to Corpus you can not get TLE (cause you are on leave). You can get TLE once you check in if you don't have a house/apt.
You don't have to check in, you just have to be there in the location. For instance, if you were to leave Pensacola for San Diego, but are moving and selling your house:
Check out of old command, but stay in a hotel for 4 days while closing, HHG, etc.
Travel for 4 days, staying in hotel each night
Arrive in San Diego, but don't check in yet, awaiting HHG, getting housing all set, stay in Hotel/BOQ for 6 days.
You will get paid for the 4 days in Pensacola and the 6 days in San Diego, but not the travel days in between. This is to stop you from taking a government funded vacation on your PCS orders. So you can collect TLE at either your old duty station, your new duty station, or both, but not in between.
Trust me, I had to argue this point with the retards down at PSD in Pensacola. They just wanted to pay me for my old duty station and not the $1000 bill that I racked up in the Residence Inn here.