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The warning label gave me pause. I didn't see anything i thought was a mercury relay. I googled cos/mos ics. I think it may be a warning about power supply limitations but I am lack the knowledge on these matters and thought it would be better to ask than send in a hazardous board.
As a side note, being silver rather than gold would this board still qualify as low telecom? Thank you in advance
Ross

It’s about static and power protection

yes the ‘silver’ board is low telco.

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Thank you

Well, I found the procedure referenced in an obscure electrical reference guide.

In short, discharge and don’t wear conductive clothing.

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Good catch, even though it didn't turn out to be Hg, the wetted relays are a similar form factor. Luckily, they are almost always by law labelled as such (see photo).
We get box truck loads of telecom boards from a decommissioning once a month or so and the low end power supply boards and a couple others have contained them, so I have to be super careful to remove them before shipping to the refinery. Just one of those bad boys can contaminate an entire load.