Testing for asbestos in vinyl or linoleum flooring sheet?
A: Lab test is the only way.
B: In most parts of the civilized world, 1987 is VERY late for still having asbestos in any building product.
C: You already removed it, which means you already handled it and made whatever dust there was to be made. Can't put that genie back in the bottle. However, See item B, as well as know that chronic exposure is much more of an issue than a one-time short-term event in the asbestos risk profile.