[Elsdebo]

I just repeated what Mothered said sometime ago. The thread was about dark purple dissapearing ink, which can be made visible again with chemicals.  Are you using this one? 
If you do it repeatedly on the same service point yes you will get in trouble. I can imagine someone working there asking themselves: This is already the second package without a label this month and last month there were 3?!

If you cannot imagine these risks then I think you should not use dissapearing ink often at all.

Came up one idea in my mind just right now, you can do something like ftidv3/v5 the label and than print the label with the ink, with this even if they recover the ink they cant reach you because your informations are not on the label, i think is really hard for some kinda of investigation if you use both methods together at the same time

The tracking code or tracking label provided to you by the company you are SEing is tied to your (drop) house and refund case. If you have a fake ID on those then you are safer yes.
I am glad you are thinking it over more now. Good luck.