Tomb Raider demos for PSX/PS2: levels not in full games?

I got into Intel computers pretty late. At the time the first 2-3 Tomb
Raider games came out, all I knew was that they starred Lara Croft and were
popular on the Playstation.

One day several years ago, I was in K-Mart and they had a PSX or PS2
hooked up so that you could play it. It was sitting there mid-game and I
remember looking at it and thinking, "It's Tomb Raider". I'm 99% sure that
it was Lara Croft and I figured it was either a copy of the full game that
someone in the store put in, or a demo disc with a playable demo of one of
the games.

Well, I recently finished Tomb Raider Chronicles (TR5) and what I saw on
that system in the store wasn't in any of the games. I played the computer
versions, but all the walkthroughs say that the PSX/PS2 versions are the
same. I doubt very much that it was Angel of Darkness because that only
came out in 2003 and it had to be 7-8 years ago that I saw this.

Here's what I remember;

When I saw it, Lara was in a small room. I believe there was a large urn
and also a mummy shambling around. The only exit was through a doorway and
down a ramp. I knew Lara was supposed to have weapons, so I pressed every
button on the controller, but she didn't draw any guns. So I ran down the
ramp and the mummy didn't follow me. At the bottom of the ramp was a large,
dark room with Egyptian symbols on the walls, a large wheel with wooden
spokes was sticking out of the ground (like the wheels you turn in Last
Revelation and Chronicles to open doors, except that I think this one was a
little bigger) and standing near one wall was an old man with a torch. I'm
not positive, but I believe he was dressed in robes. I think he watched you
as you moved around, but didn't move himself. I also couldn't seem to
interact with him at all. There were a couple different exits from the
room, but they had the monitor set so dark that any area not illuminated by
the old man's torch was completely pitch black. I also had never played a
TR game before so I had no idea what I was doing.

Thinking about it now, it seems like it most resembled The Last
Revelation, but that room wasn't in TR:LR.

Does anyone know if there were any Tomb Raider demos for the PSX/PS2 that
contained levels that weren't taken from any of the full games? Or is this
a level from Angel of Darkness and I just have the time frame all off?

> ramp and the mummy didn't follow me. At the bottom of the ramp was a large,
> dark room with Egyptian symbols on the walls, a large wheel with wooden
> spokes was sticking out of the ground (like the wheels you turn in Last
> Revelation and Chronicles to open doors, except that I think this one was a
> little bigger) and standing near one wall was an old man with a torch.

I think this was from the Last Revelation Demo, but I can't get that to
work on my system.