Ten years ago, I would've said all '53 Js had a trunk lid - I would have been wrong. Examples without trunk lids exist but are few and far between. I've encountered 2 of them since 2004 and they were authentic. My friend Todd Spreck called me once to tell me he had picked up two junked Henry Js in northwestern MN and one was a '53 without a trunk lid. I wanted to stop and see it. I thought for sure I would look at the tags, find out it did not have a dome light or bracket on the firewall for the Delco style regulators that the '53s had and laugh and tell him it was a '51 which someone put '53 fenders on. Well, I got there and checked it out - it was K533, with a dome light, round pedal stems, Delco regulator... everything a '53 would have and it did not have a trunk lid. It was AG 34. KF Bulletin 323 which announces the new features of the '52 Henry Corsair and Corsair Deluxe states that "Trunk lids are still optional..." but you see very few of the later cars without one. The day I saw Todd's car, I didn't have a camera with me but he did send me some pictures but I can't find them right now. There was also one on ebay a couple of years ago - I e-mailed the seller and asked for the info, again I don't recall where I put the info but it too was a 4 cylinder car and equipped with AG 34. Seeing only two in my 53 years in the hobby means they're pretty rare.
It is very easy to bolt fenders and grill from a different year car on a J and you see that done quite frequently. If you want to prove it really is a '53 (and I've seen cars where tags have been switched too!) here are some telltales:
A '53 Henry J has a bracket spot welded to the firewall to mount the Delco regulator - earlier cars to not have this:
On the earlier cars, the regulator is mounted under the drip lip and bolted directly to the firewall - no bracket.
A '53 also has a semi circular speedo (which could've been changed) and the windshield wiper control is mounted on the face of the dash, above the ignition switch, instead of top center as the early cars:
And a '53 will have a domelight - all models, not just the deluxe. A '53 will also have round stems on the clutch and brake pedals whereas the older cars had flat ones. These are all things the would be very difficult to change. I'd like to see pictures of the data tag. I believe only the Corsair (4 cylinder) was available without the deck lid in '53 but I have no legit documentation to back that up.