Regarding Castle of Silence mystery chest

There is a chest that Grogor, according to his walkthrough, was never able to get to. And based on the event codes for a couple of doors in the castle (and all the switches there as well), it just doesn't seem like it's possible. However, in case I'm wrong, has anyone been able to legitimately get to that chest? And if so, how? It actually has items in it, FTR.

Yes, you CAN reach it after the 3Dazer! Set a Floyd's Beacon anchor right in front of the locked door, then Egress, go back to the second room, and deactivate BOTH switches in that hallway. Then teleport back to the anchor, and voila! A Zapoo Diamond, an Ocean Love, and an Ogre Blood are now yours! I had already included it in my walkthrough.

luthius wrote:

Yes, you CAN reach it after the 3Dazer! Set a Floyd's Beacon anchor right in front of the locked door, then Egress, go back to the second room, and deactivate BOTH switches in that hallway. Then teleport back to the anchor, and voila! A Zapoo Diamond, an Ocean Love, and an Ogre Blood are now yours! I had already included it in my walkthrough.

Oh, forgot about that (been a long while)! Need to look out for your walkthrough then later once I get to the 3Dazer part. Thanks.