Tracklist
| A | He Knows My Key (Is Always In The Mailbox) | 2:42 |
| B | So Nice, I Had To Kiss You Twice | 2:39 |
Barcode and Other Identifiers
- Matrix / Runout (Side A etched): BRS 1003
- Matrix / Runout (Side B etched): BRS 1004
Other versions
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| 45-3500 | Vivian Copeland | He Knows My Key (Is Always In The Mailbox) / So Nice, I Had To Kiss You Twice (7") | D'Oro Records | 45-3500 | US | Unknown |
| 45-3500 | Vivian Copeland | He Knows My Key (Is Always In The Mailbox) / So Nice, I Had To Kiss You Twice (7", Promo) | D'Oro Records | 45-3500 | US | Unknown |
| DO-3500 | Vivian Copeland | He Knows My Key (Is Always In The Mailbox) / So Nice, I Had To Kiss You Twice (7", Single) | D'Oro Records | DO-3500 | US | Unknown |
