Do Higher Value I Grills Really Exist?

I'm far from an expert, but am very interested in I grills. Searching certificate databases from the APS, PSE, and PF, I find only two records, all at PF, for Sc 140A (12c Henry Clay; Cert 574281) and 144A (90c Admiral Perry). No cert in a searchable database appears to exist for 143A (30c Alexander Hamilton). Siegel shows none of these stamps in its database. StampSmarter.org, an excellent resource!, does not include the I grills at all. So, do these three stamps really exist?

Scott notes that the 30 and 90 cent I grills are unique.

Siegel sold a 140 and 143 I grill here: https://stampauctionnetwork.com/y/Y101444.cfm

There is more than a bit of ambiguity related to these issues. The PF cert number for the 143 is 496429 and the cert description is as follows:




http://pfsearch.org/pfsearch/pf_grd...lledfrom=lkp

The 140 is PF cert 495739 with a description as follows:




http://pfsearch.org/pfsearch/pf_grd...lledfrom=lkp

I appreciate the responses - not sure how I misse the Siegel sales info. Will just have to keep waiting and watching.

Meanwhile, an I Grill survey curtesy SAN:
https://stampauctionnetwork.com/cen...34a-144a.pdf

I would take the 143A and 144A's sold by Aldrich and shown in the SAN document with a grain of salt. Especially the 244A with a 2019 PSAG cert that sold for $300! Same for the 144A sold by Downeast Stamps. They sold for way too little which tells me that bidders were not convinced. Nor should they have been. The Aldrich 143A did not even have a certificate.

Yeah, those Aldrich ones are not I grills. I remember that auction; the lister was listing them not in Scott order but in 136,136A, 137, 137A, etc. order and just copied over the sparse description from a 138A to all the subsequent grilled banknote lots and then forgot to change "I" back to "H".