That percentage numbers are approximated.
Even if it is shown here as 100% that particular bot may not have all of your items.
The same case is if you have a lot of items in returns,
bot that isn't listed here as 100% can have all your items.
The main reason for this is that people trade with bots almost whole time
but backpacks here at website are updated every 5 minutes.
What is more to calculate those numbers only one kind of same item is taken.
You can trade some of your items with one bot and rest with other(s)