you can use the below script to find when the table got accessed last time

WITH LastActivity (ObjectID, LastAction) AS

(

SELECT object_id AS TableName,

last_user_seek as LastAction

FROM sys.dm_db_index_usage_stats u

WHERE database_id = db_id('DBNAME')

UNION

SELECT object_id AS TableName,

last_user_scan as LastAction

FROM sys.dm_db_index_usage_stats u

WHERE database_id = db_id('DBNAME')

UNION

SELECT object_id AS TableName,

last_user_lookup as LastAction

FROM sys.dm_db_index_usage_stats u

WHERE database_id = db_id('DBNAme')

)

SELECT OBJECT_NAME(so.object_id) AS TableName,

MAX(la.LastAction) as LastSelect

FROM sys.objects so

LEFT

JOIN LastActivity la

on so.object_id = la.ObjectID

WHERE so.type = 'U'

AND so.object_id > 100

GROUP BY OBJECT_NAME(so.object_id)

ORDER BY OBJECT_NAME(so.object_id)