Not sure if people know what the process to follow is (and I didn't go through the entire thread).
But I was in the same situation, came on a work permit March 2017, temporarily imported car from the States and became a landed permanent resident through inland landing in February.
When I called CBSA, twice, they were adamant that I need to go to the border and I cannot get permanent import done from an inland CBSA office. I took a chance and went to the CBSA office in Mississaugua (2720 Britannia Rd E, Mississauga) and I was able to complete the import with no problems whatsoever. Now starting off with the RIV process.
But I was in the same situation, came on a work permit March 2017, temporarily imported car from the States and became a landed permanent resident through inland landing in February.
When I called CBSA, twice, they were adamant that I need to go to the border and I cannot get permanent import done from an inland CBSA office. I took a chance and went to the CBSA office in Mississaugua (2720 Britannia Rd E, Mississauga) and I was able to complete the import with no problems whatsoever. Now starting off with the RIV process.