The round ones are plugs to seal the 'peep-hole' on the non-automatic Hasselblad magazines when they are used with 220 film (which, contrary to 120 film has no paper backing).
Hence the "220" on there.
The long one looks like the cap to go on the PC-contact and TTL-contact on 200-series bodies.
I think it is the plastic end cap that fits into the outside end of the main frame of the first version of the flashgun bracket / grip (45020)? Didn't want you to spend too much more time wondering about this!