Police who accompanied Richardson to the scene could find only his own skid marks as evidence; but on a later visit, Richardson himself found a small lump of metal which might have come from the UFO.

Three days later, at 11 pm, two men in their twenties appeared at Richardson's home and questioned him for about 10 minutes. They did not identify themselves, and Richardson - to his own subsequent surprise - did not ask who they were. They were not unfriendly, gave no warnings, and just asked questions. He noted that they left in a black 1953 Cadillac. The number, when checked, was found not yet to have been issued.

A week later, Richardson received a second visit, from two different men, who arrived in a current model Dodge. They wore black suits and were dark-complexioned. Although one spoke perfect English, the second had an accent, and Richardson felt there was something vaguely foreign about them. At first, they seemed to be trying to persuade him that he had not hit anything at all; but then they asked for the piece of metal. When he told them it had gone for analysis, they threatened him: "If you want your wife to stay as pretty as she is, then you'd better get the metal back".

The existence of the metal was known only to Richardson and his wife, and to two senior members of APRO. Seemingly, the only way the strangers could have learned of its existence would be by tapping either his or APRO's telephone. There was no clear connection between the two pairs of visitors; but what both had in common was access to information that was not freely and publicly available. Perhaps it is this that is the key to the MIB mystery.