[h4mm3rsy]

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[mothered]

I thought this meant an FTID

This Is what It predominantly refers to.

But then I was told not to ask stupid questions

Your question was well and truly justified, their response wasn't.

what other method involves editing labels?

LIT- Lost In Transit.

For example, you (seemingly) return your Item for a refund/replacement, and create a shipping label with disappearing Ink that will lose Its color sometime later, leaving a blank label. As such, the package will be marked as (being) delivered but not physically assigned to anyone, hence "lost In transit".