IIRC none, but the assertion that SJL's DNA had been found is misleading because as I recall what was found was a 60% match. This doesn't mean there's a 60% probability that it's hers, apparently; it just means it's a match with 60% of the population, including her. This a lot less persuasive of her having been in that car because it really just narrows it down to her or 30 million other people. Even a 99% match would include 600 000 people.
Welcome to the thread
The keys to 37SR are a vexed question. The early reconstructions suggested that colleagues remembered her taking the keys, that witnesses saw her outside 37SR with them and that she was seen and heard her leaving 37SR having been inside. The police forensication in contrast said that nobody had been inside that day. In AS' book, MG is said to have searched inside the house before he called the police. In DV's book, MG would have gone for lunch before she needed the keys, and it's not obvious why anyone else would have remembered her taking them. All this casts doubt on whether she took them. Fogging the picture still more, a witness in the house opposite where her car was found in Stevenage Road said it was already there by 12.50. This makes it very hard for her to have been at 37SR at 12.45 before or 1pm after that viewing, and if true, points to there not having been one.
The police did look at whether she was involved with anyone in the office and concluded not. There are really only three candidates - MG, NH and the guy who was abroad on hols that week. We can eliminate the latter, and also NH for being 18yo to her 25. This leaves only MG, who does actually resemble the Kipper sketches IMO. But then if these were a description of men seen at the property that day, well, MG was there all right - looking for SJL.
The role of the keys was an important detail to bottom out, which does not appear to have been done.