[mothered]

The manager called me today and said nothing in a mixer would be harmful enough for you to throw it away

Nonsense.

The manager Is not In a position to comment on the ramifications of a faulty electrical/mechanical product. Ask him/her to read this, with specific attention to the following details.

Never try to put out a fire or flames with
water: turn off the appliance and remove
the plug from the socket and smother the
flames with a fire blanket or other
appropriate cover

Then kindly accept an apology.

and has asked for pictures or a letter from the waste disposal team.

The operative word Is "or", hence you can provide either of the two requests.

Photoshop an Image and send It.