Four.

Well, as unfortunate as the Honkit being released is, it did reveal something interesting.

Items/Creatures being dropped in a vague, unspecified location seem to not interfere with things we drop in Aubrey's current location. Additionally, it seems to damage local reality to a lesser degree, if at all.

Anyways, if we want to spawn more things perhaps we should do it elsewhere, before local reality has a few too many holes.

Edit: That said, I wouldn't be opposed to experimenting more. Perhaps some of the damage is caused not by us creating items, but our intent that our specific item is the one created.

Later once reality has settled, I propose an experiment.
We each contribute a piece of something, with the intent to combine the pieces into, well. something.