And this is the manner of the release: every creditor shall release that which he has lent to his neighbor; he shall not exact it of his neighbor and his brother, because the release of Hashem has been proclaimed.
English: "That which he has lent" — that which he has lent, and not theft or a deposit.
On the daf / in context: Only a loan that was given for expenditure is subject to shemittah; objects that remain intact (stolen goods or deposits) are not released.
Type of Learning
Derash on the verse (Sifrei) — theft and deposits are excluded from shemittah.
What Is Learned
Shemittah cancels only loans; it does not cancel the obligation to restore stolen property or a deposit that is still extant.