Hi Marc, here are my thoughts about the baton rounds you posted.
L2A2 plain case. if the baton is a soft rubber, approx 14.7cm, and has a seam that is rubbed down below the obturating ring it could be an early L2A2 baton and correct, if hard rubber, approx 15cm, with full length casting seam, it may be from an L2A1.
L2A2 black case. Incorrect baton, it should have a standard L2A2 baton that was injection moulded without a seam line, and with a dimple on the nose.
The HV370, likely to be Haley & Weller, it should have a flat ended black baton.
The last two are unused commercial cases.
Be aware that there was a batch of pointed batons made for a proposed film several years ago. These were cast in a soft black material with a full length seam, and have visible defects. When the film project was cancelled, the prop maker sold the batons and at least one person has sold them as genuine batons to unsuspecting tourists in NI. I did a post about these fakes when I bought some from an eBay seller.
Edit: I see Pete replied whilst I was (slowly) writing my response.