Daschunds - legitimate?

[Wellthen]

My DSis has sent me a link to an acquaintance advertising her daschund puppies on Facebook. Could you lovely knowledgeable people answer some questions to help me work out if my DSis is getting scammed?

I’m don’t think it would be described as a ‘puppy farm’ for these reasons:
There are videos of the pups with the link. Mum is in the videos and they all look healthy and happy (although I am certainly speaking as a non expert). There are 3 different voices in the videos and the pups are happily interacting with the people and generally playing confidently in the owners garden. DSis does vaguely know the owner and she has had daschunds for years and this is the first litter she knows of.

Obviously it’s possible this is all faked and the pups/Mum will be different when someone actually goes to buy one. DSis has said she’ll walk away if she thinks anything seems ‘off’.

I’m worried DSis won’t have the strength to walk away and, although the welfare of the puppies is paramount, puppy farm or not, I’m worried about her paying top dollar for a non purebred or non registered puppy.

So, my questions are:
They are described as kc registered. What paper work would you expect?
They are 8 weeks - is this the right age to leave Mum?
How much are purebred daschunds? These are going for £1000

KC registered - paperwork for the registration with their KC name, parents lineage possibly as well.

8 weeks - I’d think too young but I think it’s the minimum age.

£1000 is quite cheap for a pedigree dachshund, cheapest I’ve seen through reputable breeders is £1500 but if Mum is a pet then that could be why.

How much experience do you have of dachshunds? They aren’t for the feint hearted or inexperienced dog owners in my opinion.

If they are KC registered you can check before she goes via www.mykc.org.uk (tools and resources > look up a dog). You can also verify health testing results there. They should come with their registration certificate (do NOT accept 'it's been applied for, I'll post it on') and should also be microchipped in the breeder's name and come with transfer paperwork for the chip database.

From memory, dachshunds should be tested for PRA and I think one of the coat types has another test (Lafora's?) If she's had dachshunds for years I would also want to know the familial history re: IVDD.

8 weeks is fine IMO but can't help on price, sorry, it varies so much between breeds.