I'm thinking, start small.
So limit your search. And once you understand what you have found, expand from there & see what the next sets of data shows?
In my case (& assuming I'm doing it correctly) & limiting myself to C:\$Recycle.Bin & only to the (default) user accessible directory therein, & only files thereof, Everything & Salamander show the same number of files, 3086, & the same number of bytes (62,977,274, in Salamander (in Everything, Ctrl+A, right-click Properties - 62,977,274).
So in that regard, for that much data, everything & Everything agree.
Now... physically, I have $Recycle.Bin on C: & also on E:, & other then that "(default) user accessible directory", there are other directories within $Recycle.Bin, which... are not accessible under a user context, but are "As Admin" (in Salamander, but the same does not work in Windows Explorer), & those "other directories" happen to only have (literally) a few (or 1 file) within.
Note that:
c:\$recycle.bin\ display-name:"" parents:3 file:
&
c:\$recycle.bin\ parents:3 file:
return different number of results.
There (theoretically) are at least a "desktop.ini" file in those "other" directories within $Recycle.Bin.
In the former search, with display-name:''", "desktop.ini" is only found in the "user accessible" directory.
And in the latter search, desktop.ini is found in all directories within C:\$Recycle.Bin.
(In my case, that is a difference of 2 files, depending on the search.)
After that... well, I guess you have to dig through things in greater detail to get a real good understand of what is there, or not.
Also not that there can be "deadwood" in $Recycle.Bin, i.e., files that
look like "recycle bin" files, but have lost their association/meaning to "Recycle Bin" (virtual folder).
1. Everything, 3086 items, 60 MB
2. Salamander (& Recycle Bin), 3086
(Discrepancy with Recyle Bin, 1536 items x2 = 3072, may have to deal with... unsure offhand?
desktop.ini, cause that would not be a "x2" file. The subdirectories & files within, as I have not counted them in Everything,
& maybe, or not, those not User user accessible files/directories within C:\$Recycle.Bin?)
.

- Everything - Recycle Bin.png (95.14 KiB) Viewed 5756 times