One of the items from Veep Parish Church in St Austell include a silver communion cup dating back to 1579, before the English Civil War, which is thought to be worth more than £4,000.
Other artefacts include a silver flagon tankard, dated back to 1737, and a silver plate dated 1738.
Bernard Bonsey, the Veep churchwarden, originally tried getting the items back to put on display for Easter 2015. The church still does not have its deposits.
Mr Bonsey told the Daily Telegraph: "I truly believe the bank has lost the silverware but won't admit it.
"No one at Lloyds seems to know, or worse, seems at all interested, and despite repeated requests have heard absolutely nothing from them.
"This cup is pre-English Civil War and is extremely rare because during the war, the majority of the country's silver was melted to pay the troops, and therefore could be very valuable; in excess of £4,000."
"We have had no word of apology or telling us they will endeavour to find it.
"We didn't want to have to go public on this, but the bank has left us little option."
Lloyds Bank said: "We take the security of our customers items very seriously, and are currently investigating the location of the items referred to.
"We are very sorry that this investigation is taking longer than anticipated and will continue to keep St Veep Church updated on our progress."
