Can fbr probe 5 years old real estate assets?

I bought two properties 5 years and 10 years ago. Money was received by foreign remittances through encashment in picic bank which is tax exempt. The problem is i don't have full evidence of those remittances and bank says its very difficult to get records that far back as picic got merged into nib bank and nib bank merged into mcb bank.

In case i fail to get evidence about those remittances, can fbr probe these properties? As i read in news many times that fbr can't open tax cases older than 5 years.

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