I agree, I live five miles from a department, it took them 1 and a half hrs to get to a shooter threat at my home, luckily the drunk caller never showed him.
Rule of thumb is as soon as an officer starts asking questions that are obviously official ask if you are under arrest, and if they say anything other than yes book it.
People have answered your question, but I figured you would like to hear this.
DJI batteries aren't you run of the mill hobby grade batteries, DJI calls them "intelligent flight batteries" and it's not just a marketing ploy. What makes the batteries smart is their power management system. The...
Just use a cheap label maker and stick it on the back of the rear legs.
I wouldn't do anything permanent in case you want to sell it. And labels will come off without residue in case you forget to re register and the num changes