I just bought a 2012 plug-in and the rear floor board is missing the clips that hold it in place. The previous owner said he replaced the drive battery and I assume he lost/broke the clips. I am having zero luck finding anything through Toyora Parts I found the part diagram but nothing comes up when I search the circled part. I get nothing. It can't be a regular panel clip, the indent in the floorboard is over an inch around and there's barely any room between the hole and the battery.
58416D CLIP, REAR FLOOR BOARD 64726-47010-B0 LT.GRAY, TRIM1*, 4*, 6* https://parts.americantoyota.com/oem-parts/toyota-center-panel-clip-6472647010b0
Are you searching the internet for the number you've circled? That's not the part number, more a secondary number which you follow on that site, to a listing that'll have the actual part number. Byzantine eh? Anyway, that's how a lot (if not all) of the parts websites work. @ChapmanF's post illlustrates this, and shows the actual part number.