| Official |
|---|
| 1.1 | I Couldn't Believe It Was True | 2:49 | Eddy Arnold and His Tennessee Plowboys | I Couldn't Believe It Was True / It's a Sin | Eddy Arnold and His Tennessee Plowboys | Single | | RCA Victor | 20-2241 |
| 1.1 | I Couldn't Believe It Was True | ?:?? | Eddy Arnold and His Tennessee Plowboys | I Couldn't Believe It Was True / It's a Sin | Eddy Arnold and His Tennessee Plowboys | Single | | RCA Victor | 58-0039 |
| 1.1 | I Couldn't Believe It Was True | ?:?? | Eddy Arnold, The Tennessee Plowboy and his Guitar | I Couldn't Believe It Was True / It's a Sin | Eddy Arnold, The Tennessee Plowboy and his Guitar | Single | | RCA Victor | 48-0198 |
| 1.11 | I Couldn’t Believe It Was True | 2:39 | Eddy Arnold | The Tennessee Plowboy and His Guitar | Eddy Arnold | Album + Compilation | | Bear Family Records | BCD 15726 EI |
| 1.3 | I Couldn't Believe It Was True | ?:?? | Eddy Arnold | Early Hits Of "The Tennessee Plowboy" | Eddy Arnold | Album + Compilation | | ASV, Living Era | CD AJA 5321 |
| 3.8 | I Couldn’t Believe It Was True | 2:41 | Eddy Arnold | Bouquet of Roses: Essential Collection | Eddy Arnold | Album + Compilation | | Dynamic | DYN 3533 |
| 1.3 | I Couldn't Believe It Was True | 2:41 | Eddy Arnold | The Tennessee Plowboy: His 59 Finest 1944-1955 | Eddy Arnold | Album + Compilation | | Retrospective Records | |