I too was in this exact situation, there was never any bond and we weren't careful to keep the title deed in a safe place

. Q4 of 2018 is when the property was being sold.
I had a copy and was fairly sure it wouldn't pass for the original, but I also wasn't sure if the original would be needed because as you say it seems unnecessary.
The transfer attorney's paralegal advised, "
Yes, unfortunately if you cannot locate the original title deed we will need to draft a 68(1) Application for you to sign to obtain a certified copy of the deed from the Deeds Office. This will entail a cost of R1,600 plus VAT plus the deeds office fee of R518.00."
Perhaps it differs from province to province but getting the copy issued only delayed the process by about 2 weeks, this is for a property in the Western Cape (down the garden route) it was the Cape Town deeds office involved if I am not mistaken. If I had let the attorneys know that I definitely did not have the original sooner then quite possibly there would have been no delay. I only realised that I definitely needed the original title deed when I was asked to take it with when going to sign the transfer documents.
In any event find out what your transferring attorneys have to say? I think cost of replacement copies have gone up substantially in recent years but whatever the cost it, it's likely a non-negotiable and will cost you more money (
by delaying you receiving the proceeds from the sale) if the sale is delayed due to a missing title deed.