I posted this in another thread, this is what we submitted and got PPR/DM a few weeks afterwards:
* Screengrabs of instant messaging conversations between the PA and the sponsor where moving was mentioned, e.g. looking at rental listings
* Emails from sponsor to her friends back in Canada telling them she's moving back
* A government job bank profile for the sponsor
* Emails to shipping companies by the sponsor looking for quotes on moving her stuff back to Canada
* Emails to a pet moving company about moving our cats to Canada, alongside ownership documentation for the cats in her name
* Emails to sponsor's family about moving back, including emails from the sponsor herself and also from her parents to other relatives where they talk about the move
A few weeks before we received the request for further proof, we had actually decided to take a gamble and plan to move in October despite not being sure I'd have COPR by then. This was possible because I'm lucky enough to be from a visa exempt country so could go as a visitor under dual intent. Because of this we were also able to submit evidence of booking a short term rental for our first month back in Canada. But I don't think this was necessary in addition to the above to prove intent. Also, some of the above was done after the request for proof, and some was done beforehand.
We also included a letter outlining the 'narrative' of the evidence above, and explaining why some things weren't there, such as:
* Explaining we are not in the position to buy a house because we can't afford it and there's not much point contacting rental agencies until you have a firm moving date that's within a month or two
* We don't have financial assets etc to move so have limited proof of financial planning for sponsor returning
* It's difficult for the sponsor to look for a job without knowing a firm moving date and it being relatively soon, so preparation on that front was limited to having a speculative job bank profile
We were initially concerned we didn't have the type proof the letter suggests you provide ("proof that your sponsor intends to reside in Canada when you become a permanent resident. This includes but is not limited to copies of correspondence with: potential employers, real estate companies, property rental agencies, health care agencies, insurance agencies, financial institutions, etc.") but clearly given our example there's plenty other acceptable proof you can provide even if you don't have most of those things.
My strong advice would be a) not to panic about it and b) just spend time creating a paper trail of moving preparations, no matter how informal, that you could submit evidence of if you are asked to. As I said above, some of the proof we provided was actually created after we received the request (and I've seen other people on here only submit proof created after receiving the request), so it's not a huge problem if you get the request Indeed, we mentioned in our narrative letter that we were taking the request for further proof as an indication that our application was approaching the final stages and that it was a sign to begin to prepare more seriously for the move, so that's why some bits of proof were dated after the request. But it will also be much easier to comply with and satisfy them if you do get it if you've already been creating that paper trail where you can.