depositasen
-they deposited
The word depositasen is the imperfect subjunctive form of depositar in the third person plural.
See the full depositar conjugation

depositar

Cuando llegó a un quiosco, vio revistas y periódicos a la disposición del público, la lista de precios estaba pegada en local visible y una caja para que los clientes, al retirar su ejemplar, allí depositasen la cuantía pertinente.
When he stood at a newsstand, saw magazines and newspapers available to the public, the price list posted in a visible place and a box for customers to withdraw their copy, there place the relevant amount.
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