Sorry to resurrect an old thread, but I've had the misfortune of having my bag damaged recently. I went on the mishandled baggage website (
https://haqiba.qatarairways.com.qa/Haqiba) and while there is a link to the PPQ form, unfortunately, the link is a dead link - when you click on it, instead of the form you get a message saying "Sorry, an error occurred while processing your request. Please try again later or contact Qatar Airways local office."
I've subsequently been able to get a copy of this form, so for anyone else who might be looking for this form, here it is. Apologies if this has already been posted somewhere on Flyertalk - I tried searching here and on Google and wasn't able to locate the form, so subsequently had to contact Qatar Airways to ask them to send me the form.
I can't attach a PDF here so I've exported the form as JPGs. Hope this is helpful to others. PM me if you need the PDF.