If the silencer did not have blood & paint on, the relatives, in two days had to -
1: Decide in unison to attempt to frame Jeremy. All be confident in each other that no one will crack under pressure. They all had to agree to commit a serious crime & risk criminal charges.
2: Find out about back splatter.
3: Find out if any shots were contact shots which would produce back splatter.
4: Find out Sheila's, June's and Neville's blood type.
5: Find out if the rifle end had blood on it. Meaning a silencer was not used & they could not frame Jeremy.
6: Get blood which is very close to Sheila's, June's and Neville's. Assisting in getting a conviction.
7: Find out how to effectivly & realistically put the correct blood into the silencer baffles.
8: Get the right equipment to transfer the found blood into the silencer.
9: Go back to WHF and effectivly put paint onto the silencer.
10: None of them retract from their statements and attempt to frame Jeremy.
11: Find June's DNA and put it in the silencer.