In many instances it may be easier to open the reports individually and investigate the parameters.  However, the following shows how these parameters are stored in the database:
 
select 
      n.NAME as [Report Name],
      v.PROPERTYKEY as [ParamPropertyKey],
      v.TEXT as [Parameter TXT1],
      v.TEXT2 as [Parameter TXT2],
      v.TEXT3 as [Parameter TXT3],
      v.TEXT4 as [Parameter TXT4],
      v.TEXT5 as [Parameter TXT5]
from dbo.REPORTPARAMETERNAMES7 n
      join dbo.REPORTPARAMETERVALUES7 v on v.REPORTPARAMETERNAMES7ID = n.REPORTPARAMETERNAMES7ID
order by n.NAME asc


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