Whiskers, thanks for the information on the WSHM chute. I have also been in touch with Shutter on this for several years. If access to the chute is finally granted, please let me and others know before the examination.
There needs to be high quality photographs taken of this chute and certain specific areas of the chute in order to assist in determining what type of chute this is or is not. What appears on the packing card is not always accurate.
And as I have indicated previously to Shutter, I am willing to help with $ for the examination and any lab testing.
Good luck.