Scrolls can only be used by the character that picks them up. Even another character on the same account can't use the scroll. If Bob picks up the scroll, only Bob can use it.

Scrolls are only for cosmetic adjustments. (If you have "a pine yardstick" and want it to be "an oak yardstick with ruby pip markers", you can do that, but if the yardstick is old and doesn't actually work to measure things when you fill out the scroll, it will still not when you're done with it.)

Many guild-specific items can only be worked on by certain people (and some items can only take the slightest cosmetic adjustment at all, even by someone with permission to work on the item), which ends up making them only alterable in person. It is also very uncommon for the stats on anything to be changed at an alteration session. (I think I've heard of one Bard alterer who bumped quality on some musical instruments, years and years ago. There may have been someone else who did something similar with other items, but it is definitely not a common thing.)

And while some alterers are willing to describe that an item has some signs of use, we don't do ancient anything.

Man, I am a "nope" tonight! Sorry. But at least you know...

Iocanthe
Doing stuff

If Anna and Bob have that kinda trust, absolutely it is okay. Just the scroll wouldn't work if Bob gave it to Anna.

Iocanthe
Doing stuff