A lost or removed SNS egg would make sense. I always thought that there was a removed sandcastle cheat given the games code. If my memory serves I think that Subdrag and Ice Mario found 59 sandcastle codes in total which seemed like an odd number . It may have either been related to the Toxic Waste in Rusty Bucket Bay or the Transformation room door ( as there is a pretty big blank space behind that door). It's also been backed up by another rare employee that that transformation room door was meant for something
https://www.gamekult.com/forum/t/int...rareware/72170
Not been on here for a while, but Banjo on Smash has bought back some great memories.