| Sg. Indef. | búðarkassi |
| Sg. Def. | búðarkassinn |
| Pl. Indef. | búðarkassar |
| Pl. Def. | búðarkassarnir |
| Sg. Indef. | búðarkassa |
| Sg. Def. | búðarkassans |
| Pl. Indef. | búðarkassa |
| Pl. Def. | búðarkassanna |
| Sg. Indef. | búðarkassa |
| Sg. Def. | búðarkassanum |
| Pl. Indef. | búðarkössum |
| Pl. Def. | búðarkössunum |
| Sg. Indef. | búðarkassa |
| Sg. Def. | búðarkassann |
| Pl. Indef. | búðarkassa |
| Pl. Def. | búðarkassana |