Check the bag list
The wings of my RV-9 are different so I can't direct you to a specific bag.
However, you should find these platenuts listed on the separate Bag List that came with your inventory. This lists the contents of each bag in detail. If you haven't unpacked the bags, then you will find the platenuts in the bag number under which they are listed. It is easy to scan the list for any part number you need
Once I cottoned on to this, I stopped unpacking the bags (except those containing only rivets) I put all the bags in an under-bed storage tray, arranged in number sequence, and I keep a laminated copy of the bag list hung on the noticeboard of the shop. Easy to find the part, easy to find the bag.
I have noticed that, wherever possible, Vans won't put two of the same type of part in the same bag to avoid confusion. So, you will usually only find one type of platenut, one size of bolt, one size of washer, etc - unless they are so different in size that they can't easily be confused - very clever.