By Louis Goss Credit Suisse accepted suspicious invoices from Sanjeev Gupta’s metals empire as collateral for a $140m (£114m) loan to Greensill Capital, just months before it collapsed in October 2020, according to reports. The Swiss bank accepted invoices, issued by Gupta’s Liberty Commodities and sold to Greensill, as collateral on the loan, even though several of the firms named on the invoices deny having worked with the steel making firm, the Financial Times reported. Credit Suisse accepted the invoices for nickel sales despite being warned by one of its biggest clients, Swiss commodities…