TobyMac

They are the base of levers, so any of these: Search Levers

Sound fine to me. When it's just 1 single parts it no problem. This is also the reason why we have low priority in adding key chains: They are pretty useless in terms of reusing the bricks, since they are all glued. And reusing is the basic of rebrickable.com. But you are always welcome to add them.

You can add lost parts on the set inventory page. Click on a part in the inventory, and open in the pop up, the tab 'My lost parts'.

added

Added

We prefer the stickers in the main inventory, because otherwise they get an part error.

Not that I know. You can always put in a suggestion on the forum for @NathanNathan to consider adding this feature

I don't know if there is an easy way to find these. Maybe @Nathan has a tool for this?

If you open the part page, there is a list of all colors this part appears in. In a green square will be a number, if you have that part as well. Open the link to the color, and you get a list with sets that have that part in that color. Again in a green square will appear a number if you have a certain set. Hop it's clear this way, otherwise I'll add a few screenshots.

I suspect that is has to do with the fact that the set (42043-1) has 2 inventory versions. Something is going wrong in the calculation. I think it uses the parts from both inventory versions combined. @Nathan , can you take a look?

It is used in 1 set, but in that set there are 3 of this part. So Unique 1, Quantity 3

No, not directly. That's why you need to upload it to bricksafe.com. That is build just for this purpose.

Yes. The easiest way is to upload them for free to bricksafe.com and copy the link into the right field when you submit the MOC

A work around is placing the set in a 'custom list'. The are found under 'My LEGO' in the menu. These lists for parts and sets are aside from your Parts Lists and Sets Lists, and don't 'count' in your collection. You can also make these custom list public, so you can share them with someone else.

Correct. We import the inventory from the same place. But there are often parts missing, usually indicating they won't be available in the PaB online as well. That's why we always need to check the instructions (when available)